Sram red 22 exogram chainset bb30 excluding bearings sram have re written the book with the red 22 crankset in order to make a lighter crankset they made it bigger to add stiffness they used less material the new sram red 22 exogram crankset is completely hollow all the way to the spider its hidden bolt pattern makes better use of carbon fiber to further improve stiffness and shed weight the stunning x glider chainrings are optimized for use with the yaw technology in the front derailleur